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art(at)zemon.name
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 Posted: Sun Aug 20, 2017 6:14 am Post subject: Z-31 questions |
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Folks,
I am looking at Z-31B, to add a ground power jack to my plane. What is the symbol at the very bottom, labeled "GND PWR 2A"? It looks like a circuit breaker with an extra line.
For a 14V airplane that will be visiting FBOs at smaller airports, is either the military style or the Piper style plug more common? When I had my Arrow, I carried my own jumper cable. Would it be reasonable to not carry that cable if I install the right jack in the plane?
Thanks,
-- Art Z.
--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel
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wtmills
Joined: 05 Feb 2007
Posts: 32
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| Posted: Sun Aug 20, 2017 7:31 am Post subject: Z-31 questions |
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Hi Art,
See chapter 1, figure 1-13 in the AeroElectric Connection.
You'll find "Pullable" and "Switch/Breaker". The latter is the one you describe.
Best,
Bill
On Sun, Aug 20, 2017 at 7:13 AM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
| Quote: | Folks,
I am looking at Z-31B, to add a ground power jack to my plane. What is the symbol at the very bottom, labeled "GND PWR 2A"? It looks like a circuit breaker with an extra line.
For a 14V airplane that will be visiting FBOs at smaller airports, is either the military style or the Piper style plug more common? When I had my Arrow, I carried my own jumper cable. Would it be reasonable to not carry that cable if I install the right jack in the plane?
Thanks,
-- Art Z.
--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel
|
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nuckolls.bob(at)aeroelect
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| Posted: Sun Aug 20, 2017 4:14 pm Post subject: Z-31 questions |
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At 09:13 AM 8/20/2017, you wrote:
| Quote: | Folks,
I am looking at Z-31B, to add a ground power jack to my plane. What is the symbol at the very bottom, labeled "GND PWR 2A"? It looks like a circuit breaker with an extra line.
|
I showed a crew-openable breaker . . . either pullable or switch-breaker
here . . . as a means by which the pilot can have control over ground
power while at the controls. the one time I had to use ground power
on my rental was in Kansas City. Overnight was -10F. The guy on the
cart had his back to me when he applied ground power to the C172XP I
was renting. EVERYTHING was lit up TOO bright . . .he had put 28v to
my 14v airplane. With his back to me I couldn't get his attention
and the stock GP jack for airplanes that year were hard-wired to the
bus.
In desperation I hit the starter and the engine thankfully lit
right off . . . was spinning like gang-busters! As soon as he
heard the engine catch, he shut the power off. I really wanted
to climb out and fuss at him . . . but I wasn't going to shut
the engine down after all that excitement. He smiled, waved and pulled
the plug to wind up the cord. I waved . . . but I didn't smile.
Everything was working okay so I came on back to Wichita. Anyhow,
that's when I decided that pilot control of the ground power
jack was a good idea . . . perhaps even ov protection.
http://tinyurl.com/m85ohwx
| Quote: | For a 14V airplane that will be visiting FBOs at smaller airports, is either the military style or the Piper style plug more common? When I had my Arrow, I carried my own jumper cable. Would it be reasonable to not carry that cable if I install the right jack in the plane?
|
Can't say . . . both jacks are in service so I'll bet
an FBO has both cables. The cable I carried on
my excursions in rentals had jumper-cable clips on
the supply end. Wanted to be able to crank from a car
battery . . . usually as plentiful as ground power carts
and it let you use a vehicle's battery too.
Bob . . .
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art(at)zemon.name
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| Posted: Sun Aug 20, 2017 6:13 pm Post subject: Z-31 questions |
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Whoa, Bob, that's one heckuva story! Thanks for explaining. I had thought that the ground power jacks in my old Cherokees had been hardwired to the bus but, not having the wiring diagrams handy, I did not know for sure.
Cheers,
-- Art Z.
On Sun, Aug 20, 2017 at 7:13 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | I showed a crew-openable breaker . . . either pullable or switch-breaker
here . . . as a means by which the pilot can have control over ground
power while at the controls. the one time I had to use ground power
on my rental was in Kansas City. Overnight was -10F. The guy on the
cart had his back to me when he applied ground power to the C172XP I
was renting. EVERYTHING was lit up TOO bright . . .he had put 28v to
my 14v airplane. With his back to me I couldn't get his attention
and the stock GP jack for airplanes that year were hard-wired to the
bus.
In desperation I hit the starter and the engine thankfully lit
right off . . . was spinning like gang-busters! As soon as he
heard the engine catch, he shut the power off. I really wanted
to climb out and fuss at him . . . but I wasn't going to shut
the engine down after all that excitement. He smiled, waved and pulled
the plug to wind up the cord. I waved . . . but I didn't smile.
Everything was working okay so I came on back to Wichita. Anyhow,
that's when I decided that pilot control of the ground power
jack was a good idea . . . perhaps even ov protection.
|
--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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nuckolls.bob(at)aeroelect
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| Posted: Wed Aug 23, 2017 3:57 pm Post subject: Z-31 questions |
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At 09:12 PM 8/20/2017, you wrote:
| Quote: | | Whoa, Bob, that's one heckuva story! Thanks for explaining. I had thought that the ground power jacks in my old Cherokees had been hardwired to the bus but, not having the wiring diagrams handy, I did not know for sure. |
Everybody has their own ideas. I looked through some early
Cessna 100 series drawings and found for the
most part, ground service was the 3-terminal,
AN2552 receptacle with only the two fat terminals
utilized to hook ground power right to the battery.
C177 1968-75 moved ground service power to the bus
with diode in pilot terminal to guard against
reversed polarity on ground cart.
In the C310 circa 1974, the ground power was AN2552
with a ground power relay energized from the pilot
terminal and tied right to the bus.
1998 A36 uses AN2552 with diode in pilot terminal
for reverse polarity protection. External power
goes right to the battery.
It would be interesting to know the narrative for
design decisions in each case.
It was kind a deja-vu reading through the electrical
system narratives on the single engine Cessnas.
Can't be absolutely sure after all these years
but I wrote a lot of that stuff back then and
the writing style seems very familar.
Bob . . .
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